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Date AD 359
Location Sirmium (in modern-day Serbia)
Summoned by
Constantius II
Number of Participants
A few bishops
Key Participants
Germinius; Basil of Ancyra; Valens; Ursacius
Purpose To prepare a creed for consideration at the split councils of Ariminum and Seleucia
Key Events
The production of the “Dated Creed” of May 22nd, 359
Ancient Descriptions
Sozomen HE 4.15-16; Socrates 2.37


M. Simonetti, “Sirmium” in The Encyclopedia of the Early Church, (New York: Oxford University Press, 1992).

R.P.C. Hanson, The Search for the Christian Doctrine of God, (New York: T&T Clark, 1988).



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